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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a642457589d75694bac8ec7aeb5a96ae841d65112d568534e64be2c8b86f1fc5' 
  AND token = 'DNpZIjWFCnvlLMEaBIFqE8XeWP/j7W2kSR//CPjCFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}